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Business Segments (Tables)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Business Segments [Table Text Block]
 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Quarter Ended September 30, 2011
 
 
 
 
 
Operating Revenue
$226.9
 
$207.4
 
$19.5
Fuel and Purchased Power Expense
74.8
 
74.8
 
—

Operating and Maintenance Expense
90.5
 
70.4
 
20.1
Depreciation Expense
22.7
 
21.4
 
1.3
Operating Income (Loss)
38.9
 
40.8
 
(1.9)
Interest Expense
(10.9)
 
(9.2)
 
(1.7)
Equity Earnings in ATC
4.7
 
4.7
 
—

Other Income (Expense)
0.5
 
0.6
 
(0.1)
Income (Loss) Before Non-Controlling Interest and Income Taxes
33.2
 
36.9
 
(3.7)
Income Tax Expense (Benefit)
12.7
 
13.1
 
(0.4)
Net Income (Loss)
20.5
 
23.8
 
(3.3)
Less: Non-Controlling Interest in Subsidiaries
—

 
—

 
—

Net Income (Loss) Attributable to ALLETE
$20.5
 
$23.8
 
$(3.3)

 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Quarter Ended September 30, 2010
 
 
 
 
 
Operating Revenue
$224.1
 
$204.8
 
$19.3
Fuel and Purchased Power Expense
79.0
 
79.0
 
—

Operating and Maintenance Expense
89.8
 
70.2
 
19.6
Depreciation Expense
20.0
 
18.9
 
1.1
Operating Income (Loss)
35.3
 
36.7
 
(1.4)
Interest Expense
(9.7)
 
(8.0)
 
(1.7)
Equity Earnings in ATC
4.5
 
4.5
 
—

Other Income (Expense)
0.6
 
1.3
 
(0.7)
Income (Loss) Before Non-Controlling Interest and Income Taxes
30.7
 
34.5
 
(3.8)
Income Tax Expense (Benefit)
11.2
 
12.4
 
(1.2)
Net Income (Loss)
19.5
 
22.1
 
(2.6)
Less: Non-Controlling Interest in Subsidiaries
(0.1)
 
—

 
(0.1)
Net Income (Loss) Attributable to ALLETE
$19.6
 
$22.1
 
$(2.5)

 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Nine Months Ended September 30, 2011
 
 
 
 
 
Operating Revenue
$689.0
 
$632.2
 
$56.8
Fuel and Purchased Power Expense
229.8
 
229.8
 
—

Operating and Maintenance Expense
276.3
 
218.8
 
57.5
Depreciation Expense
67.1
 
63.5
 
3.6
Operating Income (Loss)
115.8
 
120.1
 
(4.3)
Interest Expense
(32.6)
 
(26.9)
 
(5.7)
Equity Earnings in ATC
13.7
 
13.7
 
—

Other Income
2.3
 
1.8
 
0.5
Income (Loss) Before Non-Controlling Interest and Income Taxes
99.2
 
108.7
 
(9.5)
Income Tax Expense (Benefit)
24.7
 
28.2
 
(3.5)
Net Income (Loss)
74.5
 
80.5
 
(6.0)
Less: Non-Controlling Interest in Subsidiaries
(0.2)
 
—

 
(0.2)
Net Income (Loss) Attributable to ALLETE
$74.7
 
$80.5
 
$(5.8)
 
 
 
 
 
 
As of September 30, 2011
 
 
 
 
 
Total Assets

$2,754.4

 

$2,436.0

 

$318.4

Property, Plant and Equipment – Net

$1,902.1

 

$1,847.1

 

$55.0

Accumulated Depreciation

$1,079.0

 

$1,028.6

 

$50.4

Capital Additions

$143.5

 

$128.4

 

$15.1


 
Consolidated
 
Regulated Operations
 
Investments and Other
Millions
 
 
 
 
 
For the Nine Months Ended September 30, 2010
 
 
 
 
 
Operating Revenue
$668.9
 
$615.0
 
$53.9
Fuel and Purchased Power Expense
233.1
 
233.1
 
—

Operating and Maintenance Expense
262.9
 
209.3
 
53.6
Depreciation Expense
59.8
 
56.6
 
3.2
Operating Income (Loss)
113.1
 
116.0
 
(2.9)
Interest Expense
(28.1)
 
(23.3)
 
(4.8)
Equity Earnings in ATC
13.4
 
13.4
 
—

Other Income
3.8
 
3.6
 
0.2
Income (Loss) Before Non-Controlling Interest and Income Taxes
102.2
 
109.7
 
(7.5)
Income Tax Expense (Benefit)
40.5
 
44.5
 
(4.0)
Net Income (Loss)
61.7
 
65.2
 
(3.5)
Less: Non-Controlling Interest in Subsidiaries
(0.3)
 
—

 
(0.3)
Net Income (Loss) Attributable to ALLETE
$62.0
 
$65.2
 
$(3.2)
 
 
 
 
 
 
As of September 30, 2010
 

 
 

 
 

Total Assets

$2,579.1

 

$2,299.7

 

$279.4

Property, Plant and Equipment – Net

$1,742.6

 

$1,698.1

 

$44.5

Accumulated Depreciation

$1,022.2

 

$973.2

 

$49.0

Capital Additions

$175.5

 

$174.3

 

$1.2